#include <bits/stdc++.h>
using namespace std;
#define int long long
#define endl '\n'
#define maxn
// #define double long double
const double eps = 1e-8;
double n, m;
void work(double &ans, double l, double r, double x, double v){
	double len = min(x - l, r - x) + (r - l);
	ans = min(ans, len / v);
}
void solve(){
	double p1, p2, v1, v2;
	cin >> n>>p1>> v1 >> p2>> v2;
	if(p1 > p2) {
		swap(p1, p2);
		swap(v1, v2);
	}
	double ans = 1e9;
	// 1
	work(ans, 0, n, p1, v1);
	work(ans, 0, n, p2, v2);
	// 	2
	ans = min(ans, max((n - p1) / v1, (p2) / v2));
	// 3
	
	
	auto check = [&](double T){
		if (p1 / v1 > T || (n - p2) / v2 > T) return false;
		
		double l1 = p1 + max((T - (p1 * 2.0) / v1) * v1, (T * v1 - p1) / 2.0);
		double l2 = (n - p2) + max((T - ((n - p2) * 2.0 / v2)) * v2, (T * v2 - (n - p2)) / 2.0);
		
		return ((l1 + l2) >= n);
	};
	
	
	double l = 0, r = 1e8 , res = 0;
	while (r - l > eps){
		double mid = (l + r) / 2.0;
		if(check(mid)){
			r = mid;
		}		
		else {
			l = mid;
		}
	}
	
	ans = min(ans, l);
	
	// cout <<"!!! "<<mid<<endl;
	printf("%.10lf\n", ans);
}
signed main(){
	ios::sync_with_stdio(0);
	cin.tie(0), cout.tie(0);
	int T = 1;
	cin >> T;
	while (T --)
		solve();
}